Device for exhibiting, changeably colored designs and supporting frame therefor



May 2, 1950 F. BURCHELL DEVICE FOR EXHIBITING CHANGEABLY COLORED DESIGNS AND SUPPORTING FRAME THERE FOR 2 Sheets-Sheet 1 Filed Nov. 19, 1946 V'IIIIIIIII/IIIIII/II;Wmf0/mmmM/I I/II/I/l/IIIY/I/I/I/I/IIIl/IIIIIIIII Ill/l A 1-3? nd v 2 mm INVENTOR. f om) 5020/54 BY W MM, ATTOQ/VZU S May 2, 1950 F. BURCHELL DEVICE FOR EXHIBITING. CHANGEABLY COLORED DESIGNS AND SUPPORTING FRAME THEREFOR Filed Nov 19, 1946 2 Sheets-Sheet 2 S 8 R u v, 0/ Z w E /M E 0 a 7 N Z w W 0 W 5 w D E m A e q F v: F B Q 5 RI T 1 w w H w WW 5 4 7 ,1 5 MW 2 W Z Z Patented May 2, 1950 navroei, Fomrxnmrrm demon-Em :DESIGNS FRAME iiHQFlEFQB I his m n on e e lo co or .d e ardevices n m r sp eifiqali to] d ce r exh bi n heaee b r .00 0. edi e iensi An. object, of;theinventiqn isftotprovide-a device h w actcr Whiq isr nnl i nd: co om 11 which; the;sheets. may, be quickly and securely attached and as quickly detached, in which strains and vibrations; areminimized and prevented from harmin the sheets, in wl' ich certain of the 'sheets'arerotatably mounted; andjin which the main structure is simple and not cumbersome;

Another object of the invention is tdpmyide nav m an a r demount blrsupportine he q m iall n substent a lrfla prov e: wr an icn. a d; ca action ee wm t riel,wh lels ineth fl.

With ithese and other oloiectsgin view; their;- nt n: m ris the.... ea u estot constlz on. combination. of elements and, arrangeme f mana ement he b esciilb an n cu ht toibe defined in the appended iclaims, reference ein bad; og t accompanyi g:dr win s,formme; apart: hereof, wherein: at preferred; embodiment f thetinven ionis shown-for theipurn s of illustrative disclosure, it being expressly understood, however, that changes may be made in practice within the scope of the claims Without digressing from the inventive idea.

In the drawings Fig. 1 is an elevational view of a device embodying the invention;

Fig. 2 is a vertical section taken along line 2--2 of Fig. 1 and viewed in the direction of the arrows;

Fig. 3 is a fragmentary elevation of the demountable sheet supporting means of the invention;

Fig. 4 is an enlarged section taken along line 4-4 of Fig. 3 and viewed in the direction of the arrows;

Fig. 5 is an elevation on a reduced scale of the opposite side of the structure of Fig. 3; and

Fig. 6 is an enlarged sectional detail of a structural variation.

Referring to the drawing, Ill denotes a casing (c ss st 2; y n an onem. b01112... One; or: mOIB.11g-htSi,li|: andzzrefi ctors. l 2; are aunncrtedor secured imthe c sin .10..EA:m tors]fliisseeunedtto thezcasin and: oupledb cr xamni throueh:.a;,e. ar box. 4

- W thin d ive-shaft 1.5 A rolle ithavinaan-a e nular groovei'i: is keyed or othenwisafixedgon e ha t n. o re;a ditionalrolle si each hatin annular-grooves. I

mta a iesec -w hin: 31 3 's 'tha he mer ay ilfi ana ram-J of o ls renalanar The demountablesheeti supp facilitate removal r. the. latter When isyih engaging pgsition,however, withthering, itholds the ring in place on the rollers. The-.weightbi ring 20 will maintain a frictional. engagement between the surface. of. the. groove injroller l5 and the.pe'ripherall.surface. of.- the, ring: 20 "so.- thatthe latter, will rotatedn.itslplanewheh the roller, [.5 isdriven-hy motonl 3.1

Thev ring.,2(1,.has, anannular or perinietr-ical laterally. extending flange 23'. This .flange, has an annular or. perimet'r'ical'v groove 24.- in... one, face; The. innermostwalhzifiuot the, groove-2 4 has; in? rality, ofregularly v spaced-l openings. 2d fo pug-.- noses presentlmdescrihed. An endlessstretchable mem prin measur d-t fit e roo 2 am i dlse i el mus be ched for insertion into the groove 23.

The material that is secured on the ring 20 consists, for example, of a sheet 28 of isotropic translucent material as matte cellulose acetate and a sheet 29 of polarizing material. The sheets 28 and 29 are joined together as by cement. At a number of points eyelets 30 are secured to the joined sheets. These eyelets correspond in number to the spaces 26 in wall 25. Hook-like securing members 3| attached to eyelets 30 extend laterally from the latter in the radial direction.

These securing members are admeasured to extend into the spaces 26 and to hook around the spring 21. When 50 hooked they deform the spring 21 under tension sufficiently to draw the latter somewhat into the spaces 26 and when all are in place, the spring tension created by these deformations tends to maintain the joined sheets 28 and 29 flat and in place on the ring 20.

Ready removal of the sheets, if desired, is effected by simply removing the spring from the groove 24; If it is desired, the inner wall 25 0t 3 the groove may be bent inwardly to retain sprin 21 in the groove 24 (Fig. 6).

A second sheet 33 of polarizing material is conveniently and removably secured over the open front of the casing H] as by the screws 34 or in any other desirable way. Intermediate the ring-borne sheets 28 and 29 and the outermost sheet 33, a sheet 35 of translucent isotropic material of the same kind as sheet 28 is removably mounted as by screws 36 to a fixed frame support 31. This sheet carries designs D of bire- .fringent material, prepared for example as specified in Burchell and Ivins Patent No. 2,393,968, granted February 5, 1946, or in other suitable ways. Sheet 35 may be otherwise supported as hereinafter described.

The operation of the device is clear. When the motor rotates ring 20, its spring mounted polarizing sheet 29 is also rotated so that the plane of polarization of the light from source II is constantly changing direction. Hence that light which continues out through the birefringement design D and the outer polarizing sheet 33 whose axis of polarization is fixed, changes constantly from one color to its opposite through colors which are mixtures of those colors.

If desired, the design bearing sheet 35 and sheet 33 may each be supported by a ring exactly like the ring 20. These rings, however, would be supported fixedly from the casing 10 rather than rotatively. Moreover, the ring 20 supporting sheets 28, 29 could be stationary and, instead, a ring like ring 29 could be used to support rotatably a sheet 33. Such a ring would be driven in the same way as ring 20. The ring 20 may have other shapes than circular if desired.

While specific embodiments have been shown and described, variations in structural detail are possible and are contemplated. There is no intention of limitation to the exact details shown and described.

What is claimed is: 1. A device for supporting sheet material in substantially fiat condition comprising a framelike member having a perimetrical groove in one face and openings in the inner side wall of said groove, an endless stretchable member removably mounted in said groove, hook-like securing members permanently attached to said material and extending outwardly thereof and substantially radially into said openings and being there engaged removably with said stretchable member.

2. A device for demountably supporting sheet material in substantially fiat condition and to provide for expansion and contraction of the sheets of material while keeping them flat com- ,prising a ring-like member having an annular groove in one face and openings in the inner side wall of said groove, an endless spring removably mounted in said groove, hook-like members attached permanently to said material and extending radially thereof into said openings and there being hooked removably about said spring and when so hooked deforming the spring under tension sufficiently to draw the latter somewhat into the openings, the tension created by the deformation maintaining the sheets flat and in place on said ring-like member.

3. In a device of the character described, means for demountably supporting sheet material in substantially fiat condition and to provide for expansion and contraction of the sheet material while keeping it flat comprising a frame-like member having an annular groove in a side face and openings in the inner side wall of said groove, an endless elastic member removably mounted in said groove, hook-like members, pivotal means -for permanently supporting said hook-like members from said sheet material to extend substantially radially of said sheet material and into said openings, said hook-like members being removably hooked about said spring substantially within said openings and when so hooked deforming the elastic member under tension sufliciently to draw the latter somewhat into the openings, the tension created by the deformations maintaining the sheet material fiat and in place on said framelike member.

FFORD BURCHELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 55,473 Coursey June 12, 1866 1,188,071 Hayes June 20, 1916 1,613,933 Castleton Jan. 11, 1927 1,761,361 Oberg et al W June 3, 1930 1,819,776 Heck 1- Aug. 18, 1931 1,969,909 Simjian Aug. 14, 1934 2,018,214 Land Oct. 22, 1935 2,133,120 Stableford Oct. 11, 1938 2,169,022 Chubb Aug. 8, 1939 2,184,672 Jackman Dec. 26, 1939 2,261,957 Burchell Nov. 11, 1941 2,372,173 Bodde Mar. 27, 1945 

